Is redoing a molar root canal covered by insurance?
Sometimes, at a major-service rate on most plans, around 50%, and only with the paperwork to back it up. Plans typically want 12 to 24 months since the first root canal, the original date, and a current X-ray showing the problem. A molar retreatment (code D3348) reopens a back tooth that already had a root canal, removes the old filling material from every canal, and seals it again.
50%
Major, with the most paperwork
Most paperwork
The heaviest-documented root canal claim there is: original date, current X-ray, and a note on the failure. Missing any one of them and the claim sits.
24-month lookback
Many plans look back two years for a root canal on that molar number. Find one, and the redo is treated as part of the original and pays nothing.
Crown comes off
Redoing a molar often means going through the old crown, and a replacement crown (D2740) with a build-up (D2950) may follow. Both major, both counting against the max.
Max left, first
A molar redo plus a new crown can clear a whole annual max. One check before the referral shows the remaining max and the major percentage, in under a second.
What would a real check show for this patient's D3348?
Pick a sample plan and type your fee. This is the visibility a real-time check gives the desk for every actual patient, in under a second.
Eligibility readout · D3348
Sample- Coverage
- Active, major at 50%, lookback clear
- Frequency
- Lookback clear: last root canal on this tooth 36 months ago
- Patient share
- Type your fee to see it
Estimate from a sample plan. A real check reads the actual plan in under a second.
When D3348 is the right code
- A molar that already had a completed root canal
- Old filling material removed from all the canals
- Reinfection or a failed seal seen on a current X-ray
- Not a new root canal on a different tooth
- Old crown handled as its own separate code
Documentation payers expect
Date of the original root canal and which office did it, a current X-ray of the molar, and a note describing what failed. Plans that file retreatment as major frequently require prior authorization on molars.
Why molar retreatments get denied
What happens after the molar retreatment
The retreatment is often the smaller bill. A new build-up (D2950) and crown (D2740) usually come next, major on most plans, and here is the trap: if the old crown is younger than the plan's replacement limit, often 5 to 7 years, the new crown denies even though the redo paid. That leaves the patient with a paid root canal and a full-fee crown. The desk that avoids the surprise checks the plan's major percentage, remaining max and crown frequency before the referral, which takes one check.
D3348, quick answers
Does insurance cover redoing a root canal on a molar?
Often, as a major service at around 50%, once the plan's waiting time since the original root canal has passed, usually 12 to 24 months.
What does the plan need before it pays D3348?
The date of the original root canal, a current X-ray showing the failure, and a short note on what went wrong. Molar retreatments are the most documented root canal claim.
Will the new crown be covered too?
Only if the old crown is older than the plan's replacement limit, commonly 5 to 7 years. Otherwise the redo pays and the crown does not.
Does a molar retreatment need prior authorization?
Frequently, yes, especially on plans that file it as major. Check D3348 against the plan before the referral so the pre-approval goes in first.
Why did the first root canal count against this claim?
Plans track root canals by tooth number. If the original is inside the lookback, often 24 months, the redo is treated as part of it and denied.
More questions? Schedule 15 minutes with us and bring your toughest plan.
Every molar retreatment, verified before the referral goes out.
First month free, then $2.50 a check. No seat fees, no contract.
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CDT is maintained by the American Dental Association. This page is Valian's own plain-English summary for front-desk teams, not official CDT descriptor text, and is not billing or clinical advice. Coverage patterns are common plan behaviors; every plan differs. Verify benefits before treatment.